in xcode6 gold master, using objc_msgSend now throws a syntax error saying the number of arguments is wrong

Question

 id topLayoutGuideObj = objc_msgSend(viewController, @selector(myselector));

\"Too many arguments to function call, expected 0, h

Answer 1

See just a few lines above you referred.

 /* 
  * ...
  *
  * These functions must be cast to an appropriate function pointer type 
  * before being called. 
  */

You can call it like:

#import <objc/runtime.h>
#import <objc/message.h>

id<MyProtocol> topLayoutGuideObj = ((id (*)(id, SEL))objc_msgSend)(viewController, @selector(myselector));

OR

id (*typed_msgSend)(id, SEL) = (void *)objc_msgSend;
id<MyProtocol> topLayoutGuideObj = typed_msgSend(viewController, @selector(myselector));

Answer 2

I have checked it out, the main problem was as @Jerry Krinock said in comment of accepted answer;

1. Go to your project Build Settings
2. Search for objc_msgSend
3. Set its value to "No" instead of "Yes"